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Mesonephric duct

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Mesonephric duct
Urogenital sinus of female human embryo of eight and a half to nine weeks old.
Transverse section of a chick embryo of forty-five hours' incubation.
Details
Carnegie stage11
Days28
Precursorintermediate mesoderm
Gives rise toureteric bud
Identifiers
Latind. mesonephricus, d. Wolffi
MeSHD014928
TEduct_by_E5.6.2.0.0.0.4 E5.6.2.0.0.0.4
Anatomical terminology

The Wolffian duct (also known as archinephric duct, Leydig's duct, mesonephric duct, or nephric duct) is a paired organ found in mammals including humans during embryogenesis.

It connects the primitive kidney Wolffian body (or mesonephros) to the cloaca and serves as the anlage for certain male reproductive organs.

Development

Wolffian duct (red) degenerates in females (middle image) and develops in males (bottom).

In both the male and the female the Wolffian duct develops in to the trigone of urinary bladder, a part of the bladder wall. However, further development differentiates between the sexes in the development of the urinary and reproductive organs.

Male development

In a male, it develops into a system of connected organs between the testis and the prostate, namely the rete testis, the efferent ducts, the epididymis, the vas deferens,and the seminal vesicle. The prostate forms from the urogenital sinus.

For this it is critical that the ducts are exposed to testosterone during embryogenesis. Testosterone binds to and activates androgen receptor, affecting intracellular signals and modifying the expression of numerous genes.[1]

In the mature male, the function of this system is to store and mature sperm, and provide accessory semen fluid.

Female development

In the female, in the absence of testosterone support, the Wolffian duct regresses, and inclusions may persist. The epoophoron and Skene's glands may be present. Also, lateral to the wall of the vagina a Gartner's duct or cyst could develop as a remnant.

The derivatives can be remebered using the mnemonic, Gardener's SEED for Gartner's duct, Seminal vesicles, Epididymis, Ejaculatory duct and Ductus deferens.[2]

History

It is named after Caspar Friedrich Wolff who described the mesonephros and its ducts in his dissertation in 1759.[3]

Additional images

  • Diagram of a transverse section, showing the mode of formation of the amnion in the chick.
    Diagram of a transverse section, showing the mode of formation of the amnion in the chick.
  • Reconstruction of a human embryo of 17 mm.
    Reconstruction of a human embryo of 17 mm.
  • Cloaca of human embryo from twenty-five to twenty-seven days old.
    Cloaca of human embryo from twenty-five to twenty-seven days old.
  • Broad ligament of adult, showing epoöphoron.
    Broad ligament of adult, showing epoöphoron.
  • Transverse section of human embryo eight and a half to nine weeks old.
    Transverse section of human embryo eight and a half to nine weeks old.
  • Tail end of human embryo twenty-five to twenty-nine days old.
    Tail end of human embryo twenty-five to twenty-nine days old.
  • Tail end of human embryo thirty-two to thirty-three days old.
    Tail end of human embryo thirty-two to thirty-three days old.
  • Tail end of human embryo; from eight and a half to nine weeks old.
    Tail end of human embryo; from eight and a half to nine weeks old.
  • Primitive kidney and bladder, from a reconstruction.
    Primitive kidney and bladder, from a reconstruction.

See also

References

  1. ^ Hannema SE, Print CG, Charnock-Jones DS, Coleman N, Hughes IA (2006). "Changes in gene expression during Wolffian duct development". Horm. Res. 65 (4): 200–9. doi:10.1159/000092408. PMID 16567946.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  2. ^ "Wolffian duct: Derivatives". LifeHugger. Retrieved 2009-12-12.
  3. ^ synd/2845 at Who Named It?
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